Because Lincoln is so closely identified with what it is to be American, everyone wants to claim him, to rewrite his story to satisfy their own particular needs.

Without doubt, President [Barack] Obama is a great historical figure.

In 1957, when I was in second grade, black children integrated Central High School in Little Rock, Arkansas. We watched it on TV. All of us watched it. I don't mean Mama and Daddy and Rocky. I mean all the colored people in America watched it, together, with one set of eyes.

Like the amazing story of Anthony Johnson. This man was a slave, then became free, accumulated 250 acres, and even had his own slave, a black man who took him to court in Virginia in 1654.That man argued that he should be freed like an indentured servant. But Johnson, who we believe was a pure African from Angola, said, "No way, you're my slave." And the court agreed.

America is the greatest nation ever founded. The ideals are the greatest ever espoused in human history, and we just need the country to live up to them. But what I worry about are the 1 million black men in the prison system.

What happened in the interim is, billions of records have been digitized. Historians and scholars have always used genealogical records to tell the story of American history. It takes months and years of research. I can't even tell you how laborious that is. You have to be somebody who has a lot of free time, like a professor who can take tenure or someone with a great deal of leisure.

Our society is driven today by so much ethnic discord. We have Black Lives Matter, which I praise and celebrate. We have the demagogues stereotyping Muslims and resurrecting racist stereotypes they used to visit on us. The larger goal is to show that we are all the same, we all come from Africa, and we all have the same larger family tree. It's about the fundamental unity of the human community.